CN201846340U - Portable underwater acoustic communication device for frogman - Google Patents

Abstract

The utility model discloses a portable underwater acoustic communication device for a frogman, which is capable of simultaneously solving the problems of signal detection, user identification and rough synchronism of multi-user underwater communication by the aid of synchronous duplex pulse consisting of linear frequency-modulation pulse and chaos frequency-modulation and phase-modulation pulse, not only ensures instantaneity of signal detection but also ensures accuracy of multi-user identification and synchronism by the aid of a duplex-pulse combination, and realizes multi-user grouped M-ary spread-spectrum communication by the aid of chaos frequency-modulation and phase-modulation spread-spectrum signals. As the chaos frequency-modulation and phase-modulation spread-spectrum signals are orthogonal mutually and the number of the signals capable of being transmitted simultaneously is large, mutual interference of demodulation in multi-user communication can be reduced effectively, and communication efficiency and performance of multi-user underwater sound communication can be improved effectively. Besides, the portable underwater acoustic communication device is convenient for the frogman to carry.

Description

A kind of frogman is with portable underwater sound communication equipment

Technical field

The utility model belongs to portable communications sonar field, particularly a kind of sonar and method of utilizing chaotic fm phase modulation sequence to carry out the communication modulation and demodulation method of packet M element spread spectrum multi-user communication.The utility model is mainly used in diving operation frogman's under water the middle short range real time communication.

Background technology

The frogman is when carrying out diving operation, and communication mode commonly used mainly contains two kinds: a kind of is sign language, but this mode is because visual range is little under water, and the distance of communication is limited; Another kind is wired mode, and because the restriction of cable, communication distance is limited on the one hand, also can influence frogman's operation on the other hand.Therefore, the frogman needs a kind of communication, satisfies the problem of subsurface communication.Because sound wave is unique under water media that can long-range propagation, communication sonar is a kind of effective means that solves frogman's communication issue.Yet the common communications sonar is not suitable for the frogman and carries because size is bigger.And some United States Patent (USP)s (Earl Kent Hunter, etc., Diver communication system, P3789353; Lvan Gardos, etc., Integrated diver face mask and ultrasound underwater voice communication apparatus, P5136555) the ultrasonic wave single-sideband communication mode of Cai Yonging, its communication distance and communication bandwidth are all limited, and can't satisfy the requirement that the multi-user communicates by letter simultaneously.The utility model utilizes chaotic fm phase modulation sequence to carry out the communication of packet M element spread spectrum multi-user, designed portable underwater sound communication sonar, the requirement of real time communication between frogman and water surface base, frogman and the frogman not only can be satisfied, and the requirement that the multi-user communicates by letter simultaneously can be satisfied.

The utility model content

The technical problems to be solved in the utility model provides a kind of frogman with portable underwater sound communication apparatus and method for, utilize chaotic fm phase modulation sequence to carry out the communication of packet M element spread spectrum multi-user, come the portable communications sonar and the method for short range real time communication among the satisfied frogman under water.The utility model is by dipulse detection, user ID and method for synchronous with based on the packet M element band spectrum modulation and the Multiuser Detection demodulation method of chaotic fm phase modulation sequence, finish between the frogman and frogman and water surface base between middle short range bi-directional half-duplex real-time voice and message communication.

For solving the problems of the technologies described above, the utility model provides following technical scheme: a kind of frogman is with portable underwater sound communication equipment, comprise data input device, the communications transmit device, communication receiving device, data output device and the power supply and the interface arrangement that are connected with each device, wherein: described data input device is gathered voice signal, be sent to the communications transmit device behind the compressed coding of voice signal, the communications transmit device becomes acoustical signal to send in the underwater acoustic channel conversion of signals that receives, acoustical signal in the underwater acoustic channel is communicated by letter after the receiving device collection, change into the signal of telecommunication and be sent to data output device, data output device is play by earphone after with signal of telecommunication conversion processing.

As a kind of preferred version of frogman described in the utility model, wherein with portable underwater sound communication equipment:

Described data input device comprises microphone, audio coder and control module, described audio coder carries out the real non-destructive voice compression coding with the voice signal of microphone collection, and is sent to the communications transmit device, and described control module is provided with commands for controlling communications transmit device by knob;

Described communications transmit device comprises: parameter selector, user's mapper, data encoder, packet device, chaos sequence generator, the chaotic maps device, the Chaos Modulation device, clock-pulse generator, waveform generator, emission conversion and control module, transducer is put in matching network and power amplifier and transmitting-receiving altogether; Wherein, the instruction that described parameter selector provides according to control module, selection and frequency range and data transfer rate that the emission information category is complementary offer user's mapper and data encoder respectively; The chaos parameter that the parameter that described user's mapper provides according to parameter selector is selected to be complementary with the user sends to chaotic maps device and chaos sequence generator; Described data encoder carries out source encoding and chnnel coding according to the parameter that parameter selector provides to the speech data that message is instructed or audio coder provides that control module provides; Described packet device divides into groups the data flow that data encoder sends, and is sent to the Chaos Modulation device; Described chaos sequence generator produces the chaos sequence of being determined by different initial values according to the parameter that user's mapper provides by the chaotic maps equation, and is sent to chaotic maps device and clock-pulse generator; The parameter that described chaotic maps device is provided according to user's mapper is shone upon the chaos sequence that chaos sequence generator produced and is generated mutually orthogonal chaotic fm value sequence mapping grouping and chaos phase modulation value sequence mapping grouping, and these groupings are sent to the Chaos Modulation device; Chaotic fm value sequence mapping grouping and chaos phase modulation value sequence mapping grouping that described Chaos Modulation device provides according to the chaotic maps device, carry out the modulation of packet M element chaos spread spectrum, the packet that the packet device is provided is modulated into transmit data blocks, and is sent to waveform generator; User's synchronous chaos sequence that clock-pulse generator provides according to chaos sequence generator generates and forms synchronous dipulse by chirp and chaotic fm phase-modulated pulse, and is sent to waveform generator; The synchronous dipulse that transmit data blocks that waveform generator provides the Chaos Modulation device and clock-pulse generator provide makes up and generates final communications transmit signal, and sends to emission conversion and control module; Described emission conversion and control module are carried out D/A switch and emission conditioning with the communications transmit signal, and analog transmit signal and emission parameter are delivered to matching network and power amplifier; Described matching network and power amplifier drive the power amplification and the coupling of carrying out analog transmit signal by emission conversion and control module; Described transmitting-receiving is put transducer altogether and is positioned at cylindric elongated watertight jar top, under the driving of matching network and power amplifier, converts analog transmit signal to acoustical signal and sends in the underwater acoustic channel;

Described communication receiving device comprises that transmitting-receiving puts transducer, pre-filtering and amplifier, A/D converter, synchronizing indicator, clock-pulse generator, chaos sequence generator, copy maker, channel equalizer, chaos demodulator, data decoder altogether; Wherein, described transmitting-receiving is put transducer altogether and is responsible for gathering underwater sound data, carries out the acoustic-electric conversion and is sent to pre-filtering and amplifier; Described pre-filtering and amplifier carry out filtering and amplification to analog receiving signal, deliver to A/D converter; Described A/D converter converts analog receiving signal to digital signal, is sent to synchronizing indicator; Described chaos sequence generator produces the chaos sequence that all users may use in the channel by the chaotic maps equation, and is sent to copy maker and clock-pulse generator; Multi-user's synchronous chaos sequence that described clock-pulse generator provides according to chaos sequence generator generates and forms the synchronous dipulse copy of multi-user by chirp and chaotic fm phase-modulated pulse, and is sent to synchronizing indicator; Described synchronizing indicator communicates input according to the synchronous dipulse copy of multi-user that clock-pulse generator provides, if detect signal of communication then after carrying out synchronously data are sent to channel equalizer, and the respective user sign is sent to the copy maker; Described channel equalizer carries out channel equalization to signal of communication, after deliver to the chaos demodulator; The user ID that chaos sequence that described copy maker provides according to chaos sequence generator and synchronizing indicator provide generates corresponding multi-user's packet M element spread spectrum copy set, delivers to the chaos demodulator; The correlation demodulation of chaos spread spectrum sequence is carried out in multi-user's packet M element spread spectrum copy set that data that described chaos demodulator provides according to channel equalizer and copy maker provide, and the generating solution adjusting data also is sent to data decoder; Described data decoder is decoded demodulating data and is generated reception information, is sent to data output device;

Described data output device comprises user's arbiter, message mapper, and audio coder and earphone, described user's arbiter is differentiated the data that communication receiving device obtains, and speech data is sent to audio coder, and message data is sent to message mapper; Described message mapper becomes to preset audio data stream with the message data content map and is sent to the earphone broadcast; Described audio decoder carries out the decoding of real non-destructive compress speech with speech data, and the decoded speech data flow is sent to the earphone broadcast.

As a kind of preferred version of frogman described in the utility model with portable underwater sound communication equipment, wherein: described communications transmit device and the shared chaos sequence generator of communication receiving device, transducer is put in clock-pulse generator and transmitting-receiving altogether.

As a kind of preferred version of frogman described in the utility model with portable underwater sound communication equipment, wherein: equipment body is by elongated watertight jar, frogman's face shield and frogman's waistband three parts are formed, three parts connect by cable, described earphone and microphone are installed on frogman's face shield, described control module is arranged on frogman's waistband, and described power supply and interface module are arranged on the elongated watertight jar, and the top that transducer is arranged on elongated watertight jar is put in described transmitting-receiving altogether.

Compared with prior art, the utlity model has following advantage:

1, the synchronous dipulse formed by chirp and chaotic fm phase-modulated pulse of the utility model utilization, can solve input, user ID and the thick stationary problem of multi-user's subsurface communication simultaneously, utilize the dipulse combination both to guarantee the real-time of input, guaranteed multi-user's sign and synchronous accuracy again

2, the utility model utilizes chaotic fm phase modulation spread-spectrum signal to carry out multi-user's packet M element spread spectrum communication, it is because mutually orthogonal and but the subsequent signal number is many between each chaotic fm phase modulation spread-spectrum signal, the mutual interference of demodulation simultaneously influences in the time of can reducing multi-user communication effectively, can improve the communication efficiency and the performance of multi-user's underwater sound communication effectively.

3, equipment of the present utility model can combine with existing frogman's equipment, is convenient to the frogman and carries.

4, equipment of the present utility model also is suitable for the unmanned device formation use of diving under water.

5, part technology of the present utility model is not only applicable to also be applicable in radio communication and the optical fiber communication in the underwater sound communication.

Description of drawings

Fig. 1 represents that the frogman is with portable underwater sound communication equipment schematic diagram.

Fig. 2 represents that the frogman is with portable underwater sound communication system block diagram.

Fig. 3 represents that the frogman is with portable underwater sound communication system transmitted pulse schematic diagram.

Fig. 4 represents the chaotic fm sequence sequential chart that the Quadratic mapping is produced.

Fig. 5 represents the chaotic fm sequence autocorrelogram that the Quadratic mapping is produced.

Fig. 6 represents the chaotic fm sequence cross-correlation figure that the Quadratic mapping is produced.

Fig. 7 represents that the one dimension chaos sequence directly shines upon schematic diagram.

Fig. 8 represents that the dipulse user detects and the FB(flow block) of coarse synchronization method.

Fig. 9 represents the FB(flow block) of multi-user's packet M element spread spectrum demodulation method.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is done to describe further.Wherein comprised frogman's face shield 1, microphone 2, earphone 3, cable 4, data interface module 5, cylindric elongated watertight jar 6 among Fig. 1, received and dispatched and put transducer 7, battery and power management module 8, electronics section 9, frogman's waistband 10, control module 11 altogether.

Embodiment 1

Present embodiment provide under water in the short range real time communication the frogman with portable underwater sound communication equipment as shown in Figure 1, equipment body is by cylindric elongated watertight jar 6, frogman's face shield 1 and frogman's waistband 10 3 parts composition.Can be divided into data output device, data input device, communications transmit device, communication receiving device, power supply and five parts of interface arrangement by the function division.Wherein, the functional block diagram of preceding four parts as shown in Figure 2.Present embodiment will be described the frogman carries out message communication by the utility model equipment and water surface base process.

Described data input device comprises: microphone, audio coder and control module.Described microphone is installed on frogman's face shield bottom as shown in Figure 1, gathers frogman's speech data; Described audio coder is in cylindric elongated watertight jar inside, with the microphone collection carry out the real non-destructive voice compression coding, and be sent to the communications transmit device; Described control module is installed on frogman's waistband, by knob commands for controlling communications transmit equipment is set.

Described communications transmit device comprises: parameter selector, user's mapper, data encoder, packet device, chaos sequence generator, the chaotic maps device, the Chaos Modulation device, clock-pulse generator, waveform generator, emission conversion and control module, transducer is put in matching network and power amplifier and transmitting-receiving altogether.Chaos sequence generator wherein, clock-pulse generator and transmitting-receiving puts transducer altogether and communication receiving device is shared.Put altogether the transducer except that transmitting-receiving, other module is all in cylindric elongated watertight jar inside.

The instruction that described parameter selector provides according to control module, selection and frequency range and data transfer rate that the emission information category is complementary offer user's mapper and data encoder respectively.The chaos parameter that the parameter that described user's mapper provides according to parameter selector is selected to be complementary with the user sends to chaotic maps device and chaos sequence generator.Described data encoder carries out source encoding and chnnel coding according to the parameter that parameter selector provides to the speech data that message is instructed or audio coder provides that control module provides.Described packet device divides into groups the data flow that data encoder sends, and is sent to the Chaos Modulation device.Described chaos sequence generator produces the chaos sequence of being determined by different initial values according to the parameter that user's mapper provides by the chaotic maps equation, and is sent to chaotic maps device and clock-pulse generator.The parameter that described chaotic maps device is provided according to user's mapper is shone upon the chaos sequence that chaos sequence generator produced and is generated mutually orthogonal chaotic fm value sequence mapping grouping and chaos phase modulation value sequence mapping grouping, and these groupings are sent to the Chaos Modulation device.Chaotic fm value sequence mapping grouping and chaos phase modulation value sequence mapping grouping that described Chaos Modulation device provides according to the chaotic maps device, carry out the modulation of packet M element chaos spread spectrum, the packet that the packet device is provided is modulated into transmit data blocks, and is sent to waveform generator.User's synchronous chaos sequence that clock-pulse generator provides according to chaos sequence generator generates and forms synchronous dipulse by chirp and chaotic fm phase-modulated pulse, and is sent to waveform generator.The synchronous dipulse that transmit data blocks that waveform generator provides the Chaos Modulation device and clock-pulse generator provide makes up and generates final communications transmit signal, and sends to emission conversion and control module.Described emission conversion and control module are carried out D/A switch and emission conditioning with the communications transmit signal, and analog transmit signal and emission parameter are delivered to matching network and power amplifier.Described matching network and power amplifier drive the power amplification and the coupling of carrying out analog transmit signal by emission conversion and control module.Described transmitting-receiving is put transducer altogether and is positioned at cylindric elongated watertight jar top, under the driving of matching network and power amplifier, becomes acoustical signal to send in the underwater acoustic channel analog transmissions electrical signal conversion.

Described communication receiving device comprises: transmitting-receiving is put transducer, pre-filtering and amplifier, A/D converter, synchronizing indicator, clock-pulse generator, chaos sequence generator, copy maker, channel equalizer, chaos demodulator, data decoder altogether.Chaos sequence generator wherein, clock-pulse generator and transducer is put in transmitting-receiving altogether and the communications transmit device is shared.Put altogether the transducer except that transmitting-receiving, other module is all in cylindric elongated watertight jar inside.

Described transmitting-receiving is put transducer altogether and is positioned at cylindric elongated watertight jar top, is responsible for gathering underwater sound data, carries out the acoustic-electric conversion and is sent to pre-filtering and amplifier.Described pre-filtering and amplifier carry out filtering and amplification to analog receiving signal, deliver to A/D converter.Described A/D converter converts analog receiving signal to digital signal, is sent to synchronizing indicator.Described chaos sequence generator produces the chaos sequence that all users may use in the channel by the chaotic maps equation, and is sent to copy maker and clock-pulse generator.Multi-user's synchronous chaos sequence that described clock-pulse generator provides according to chaos sequence generator generates and forms the synchronous dipulse copy of multi-user by chirp and chaotic fm phase-modulated pulse, and is sent to synchronizing indicator.Described synchronizing indicator communicates input according to the synchronous dipulse copy of multi-user that clock-pulse generator provides, if detect signal of communication then after carrying out synchronously data are sent to channel equalizer, and the respective user sign is sent to the copy maker.Described channel equalizer carries out channel equalization to signal of communication, after deliver to the chaos demodulator.The user ID that chaos sequence that described copy maker provides according to chaos sequence generator and synchronizing indicator provide generates corresponding multi-user's packet M element spread spectrum copy set, delivers to the chaos demodulator.The correlation demodulation of chaos spread spectrum sequence is carried out in multi-user's packet M element spread spectrum copy set that data that described chaos demodulator provides according to channel equalizer and copy maker provide, and the generating solution adjusting data also is sent to data decoder.Described data decoder is decoded demodulating data and is generated reception information, is sent to data output device.

Described data output device comprises: user's arbiter, message mapper, audio coder and earphone.Described user's arbiter is differentiated the data that communication receiving device obtains, and speech data is sent to audio coder, and message data is sent to message mapper; Described message mapper becomes to preset audio data stream with the message data content map and is sent to the earphone broadcast; Described audio decoder carries out the decoding of real non-destructive compress speech with speech data, and the decoded speech data flow is sent to the earphone broadcast; Described earphone is installed on frogman's face shield both sides as shown in Figure 1, the information that playing device receives.Except that receiving earphone, other module is all in cylindric elongated watertight jar inside.

Described power supply and interface arrangement comprise: battery and power management module, data interface module.Described battery and power management module in cylindric elongated watertight jar inside, are responsible for the power supply of entire equipment.Described data interface module is positioned at cylindric elongated watertight jar two ends, puts transducer, earphone, microphone, control module altogether and is connected to watertight jar inside by being positioned at the underwater electrical connector on the two end cap, making the transmitting-receiving that is positioned at watertight jar outside.

The frogman that present embodiment provides uses portable underwater acoustic communication method, comprises data input process, communications transmit process and communications reception process, data output procedure, and wherein said communications transmit process comprises the steps:

1), determines the parameters of emission according to the user profile that obtains by control module;

2) communication code data to be sent are divided into the data block of one group of K code element;

3) obtain chaos sequence according to certain chaotic maps relation, form chaotic fm value sequence mapping grouping and chaos phase modulation value sequence mapping grouping, and from grouping, select corresponding chaotic fm value sequence and the combination of chaos phase modulation value sequence according to the contained information of data block;

4) generate the set of chaotic fm phase modulation spread-spectrum signal by chaotic fm value sequence and the combination of chaos phase modulation value sequence, all chaotic fm phase modulation spread-spectrum signals in the described chaotic fm phase modulation spread-spectrum signal set are superimposed as one group of concurrent chaotic fm phase modulation spread-spectrum signal, and P organizes concurrent chaotic fm phase modulation spread-spectrum signal and forms a chaotic fm phase modulation frequency expansion sequence;

5) generate synchronous dipulse according to user profile, and make up, launch at last with chaotic fm phase modulation frequency expansion sequence;

Described communications reception process comprises the steps:

6) data to receiving by the synchronous dipulse copy of multi-user, are carried out the dipulse user and are detected with synchronously thick;

7) more detected user is received data and carry out channel equalization with synchronously thin;

8) then by relevant, detect and judgement, and recover coded message according to the chaotic maps relation with multi-user's packet M element spread spectrum copy set carrying out copy;

9) coded message is decoded, decoded information conversion back is play by earphone by user's arbiter and message mapper.

In the technique scheme, in the described step 1), the user sends to the message information in water surface base by the control module setting, and message information is as shown in table 1, the underwater groundwork state of reflection frogman.The parameters of described emission is meant that transmit frequency band is 10kHz～15kHz, and transmission data rate is 20bps, user ID (1～255) etc.Because the characteristics of the message communication between frogman and the water surface base are that communication distance traffic rate far away is low, so adopt low-frequency range and narrow bandwidth.

Table 1 message table

Work	Await orders	Assistance	Safety	Call for help
					1101	1011	1100	1010	0101

In the technique scheme, described step 2) in, described communication code data to be sent are to be obtained after source encoding and chnnel coding by the original communication data.Described source encoding adopts huffman coding, is used to remove redundant information; Described chnnel coding adopts convolution code or turbo sign indicating number, is used to reduce error rate of system.And the communication code data are binary data.The value of described K is 256～8912, and concrete value depends on chaotic maps model and the intersymbol interference level that is adopted, and supposes that the data block of cutting apart is (x ₁, x ₂, K, x _L), the sequence after information source and the chnnel coding is (c ₁, c ₂, K, c _K), wherein L is the preceding data length of coding, K is the data length after encoding.

In the technique scheme, in the described step 3), but so-called chaos is the certainty that occurs has the process of randomlikeness that this process is aperiodic, does not restrain but bounded, and extremely responsive to initial value in nonlinear dynamic system.The class stochastic behaviour of chaos sequence is highly suitable for the band spectrum modulation communication mechanism, and it is because extremely responsive to initial value, initial value is slightly different just to form mutual incoherent sequence, so chaotic maps can provide a large amount of, mutually orthogonal, class can determine the chaos sequence that reproduces at random again.The chaotic maps model has a lot, as Quadratic mapping, Chebyshev mapping, Second-Order mapping etc., and the chaos sequence that different chaos mapping models obtain, its correlation properties are different.Adopt the Quadratic mapping in the present embodiment, so-called Quadratic mapping equation can be expressed as:

g(m+1)＝P-Qg ²(m) (1)

Wherein, when 3/4＜PQ＜2, (2/Q 2/Q), gets Q=2 to g (m) ∈ in the present embodiment, P=1, g (0) ∈ (1,1), g (n) ∈ (1,1).

The chaos sequence that Fig. 4 is produced for the Quadratic mapping equation, sequence length are 1024, and initial value is 0.8501, its autocorrelation performance as shown in Figure 5, the auto-correlation side lobe peak is 0.0651; Its their cross correlation as shown in Figure 6, the initial value of another chaos sequence is 0.8564, cross-correlation peak value is 0.085.

The chaotic maps process of described step 3) is meant according to one or two chaotic maps model, also therefrom extracts r by the mutually orthogonal M group chaos sequence of different initial values generations and makes up the number of combinations that makes it to obtain

So that the chaos sequence combination is satisfied one-to-one relationship with the contained information of data block, the conventional value of r value is 1～128.

In the present embodiment, the chaos sequence that adopts a chaos one-dimensional model to obtain is mapped directly to frequency modulation value and phase modulation value, as shown in Figure 7.Employing step 2) Quadratic mapping equation generates M group chaos sequence note and does:

G ¹，G ²，K，G ^m，K，G ^M (2)

Wherein,

For length is the chaos sequence of N

If establish bandwidth range is B, can obtain the chaotic fm value by above-mentioned formula:

$f_n^m=g_n^m*B/2---\left(3\right)$

Can get M group chaotic fm value sequence F thus ¹, F ², K, F ^m, K, F ^M, and

$F^m=[f_1^m,f_2^m,K{f}_n^m,K,f_N^m].$

In like manner can obtain chaos phase modulation value:

${\mathrm{\ρ}}_n^m=(g_n^m+1)*\mathrm{\π}/2---\left(4\right)$

Can get M group chaos phase modulation value sequence Ω thus ¹, Ω ², K, Ω ^m, K, Ω ^M, and

And according to the contained information of data block, from M group chaotic fm value and phase modulation value sequence, extract r combination and obtain chaotic fm value and the combination of chaos phase modulation value:

(F，Ω) _r＝[(F ^m1，Ω ^m1)，K，(F ^mr，Ω ^mr)] (5)

Wherein, (m1, K is mr) by data block information (c in combination ₁, c ₂, K, c _K) determine.

The contained information of the data block of described step 3) is meant the binary numeral of a corresponding K code element, its with

Individual chaotic fm value sequence and the combination of chaos phase modulation value sequence are corresponding one by one.

In the technique scheme, in the described step 4), the method that generates concurrent chaotic fm phase modulation spread-spectrum signal is as follows: every group of chaotic fm value sequence and the combination of chaos phase modulation value sequence, it is right to comprise r chaotic fm value sequence and chaos phase modulation value sequence.Exchange according to the chaotic fm value of each sequence centering correspondence and chaos phase modulation value and to make a chaotic fm phase modulation spread-spectrum code chip, N chip formed a chaotic fm phase modulation spread-spectrum signal.According to chaotic fm value and the combination of chaos phase modulation value that the information correspondence obtains, generate r chaotic fm phase modulation spread-spectrum signal to constitute a chaotic fm phase modulation spread-spectrum signal set.

The expression formula of chaotic fm phase modulation spread-spectrum signal is:

s ^m(t)＝Acos[ω ₀t+∫c ^m(t)dt+k ^m(t)]0≤t≤T (6)

Wherein, A is a signal amplitude, ω ₀=2 π f ₀Be central angle frequency, f ₀Be centre frequency, c (t) is the frequency modulation(FM) function, has:

$c^m\left(t\right)=2\mathrm{\π}{f}_n^m{\mathrm{\ξ}}_n\left(t\right)---\left(7\right)$

Here, ξ _n(t)=u[t-nT ₀]-u[t-(n+1) T ₀] for the duration be T ₀Unit pulse function, u (t) is a step function,

N=T/T ₀

$k^m\left(t\right)={\mathrm{\ρ}}_n^m{\mathrm{\ξ}}_n\left(t\right)---\left(8\right)$

Therefore, r chaotic fm phase modulation spread-spectrum signal mutual superposition can constitute one group of concurrent chaotic fm phase modulation spread-spectrum signal.Its expression formula is:

$s_p\left(t\right)=\underset{i=1}{\overset{r}{\mathrm{\Σ}}}{s}^{\mathrm{mi}}\left(t\right)---\left(9\right)$

Wherein, s ^Mi(t) by the combination of chaotic fm value and chaos phase modulation value (F, Ω) _rObtain.

P organizes concurrent chaotic fm phase modulation spread-spectrum signal sequence arrangement, can form a chaotic fm phase modulation frequency expansion sequence, that is:

$s\left(t\right)=\underset{i=1}{\overset{P}{\mathrm{\Σ}}}{s}_i[t+(i-1)\mathrm{\τ}]---\left(10\right)$

Wherein, τ is one group of concurrent chaotic fm phase modulation spread-spectrum signal pulsewidth.

Therefore, a chaotic fm phase modulation frequency expansion sequence comprises K*P binary element.

In the technique scheme, in the described step 5), described synchronous dipulse is made up of chirp and two pulses of chaotic fm phase-modulated pulse, and chirp is mainly used in input, and the chaotic fm phase-modulated pulse is mainly used in identification transmissions user and synchronously thick.The chirp form is unique, and each equipment is all identical.The chaotic fm value of chaotic fm phase-modulated pulse correspondence and phase modulation value sequence determined by equipment, and corresponding one group of unique chaotic fm value of equipment and phase modulation value sequence are and the mutually orthogonal signal of other chaotic fm phase modulation spread-spectrum signal.During dipulse and chaotic fm phase modulation frequency expansion sequence combination synchronously, there is a fixed intervals T (as shown in Figure 3) each other, with the signal cross-talk of avoiding channel expansion to cause.The mathematic(al) representation that finally transmits is:

$p\left(t\right)=\mathrm{sy}{n}^{\mathrm{LFM}}\left(t\right)+{\mathrm{syn}}_{\mathrm{ID}}^{\mathrm{CH}}(t+{\mathrm{\τ}}_{\mathrm{LFM}})+s(t+{\mathrm{\τ}}_{\mathrm{LFM}}+{\mathrm{\τ}}_{\mathrm{CH}}+T)---\left(11\right)$

Wherein, syn ^LFM(t) be chirp, τ _LFMBe its pulsewidth;

Be chaotic fm phase-modulated pulse, τ _CHBe its pulsewidth, ID represents the equipment corresponding identification.

In the technique scheme, in the described step 6), dipulse user detects and coarse synchronization method following (as shown in Figure 8): at first by the chirp copy, carry out the copy coherent detection to receiving data; There is signal of communication if detect discovery by peak value, carry out the copy coherent detection (Q that correspondence may an exist user by chaotic fm phase-modulated pulse copy again, generate Q corresponding chaotic fm phase-modulated pulse copy, it is relevant to carry out Q copy, the gained peak value carries out threshold test, detects the respective user sign).Because between the chaotic fm phase-modulated pulse all is mutually orthogonal, it can be a plurality of detecting the number of users that detects by dipulse.Its mathematical principle is as follows:

If establish under the ideal communication channel, the expression formula of communications reception data is:

$r\left(t\right)={\mathrm{syn}}^{\mathrm{LFM}}\left(t\right)+{\mathrm{syn}}_{\mathrm{ID}}^{\mathrm{CH}}(t+{\mathrm{\τ}}_{\mathrm{LFM}})+s(t+{\mathrm{\τ}}_{\mathrm{LFM}}+{\mathrm{\τ}}_{\mathrm{CH}}+T)+n\left(t\right)---\left(12\right)$

Wherein, n (t) is a noise signal.

At first, by chirp copy rep ^LFM(t) carry out the copy coherent detection, that is:

d(t)＝∫r(t)*rep ^LFM(t-τ)dτ (13)

Because chirp copy and noise signal are quadratures, therefore detect by peak value:

Wherein, D is a detection threshold.If by the coherent detection of chirp copy to there being signal of communication, the corresponding chaotic fm phase-modulated pulse of the user copy that may exist then by Q

Q=1, Λ, Q carries out Q copy and is correlated with, that is:

$d_q\left(t\right)=\∫r\left(t\right)*\mathrm{re}{p}_q^{\mathrm{CH}}(t-\mathrm{\τ})\mathrm{d\τ},q=1,\mathrm{\Λ},Q---\left(15\right)$

Because between the chaotic fm phase-modulated pulse copy, and and noise signal between all be quadrature, therefore detect by peak value:

Can detect and receive the user that may exist in the data, because each user shares a channel in underwater acoustic channel, therefore the possibility that has the very little arrival communications receiving equipment in two above users' whiles or gap in time, therefore the number of users W that detects is generally 1, there is situation simultaneously greater than 1, this is relevant with the busy extent of communicating by letter with the distance in water surface base with each user, if distance is near or the busy number of users that detects simultaneously of communicating by letter is just many.

There is fixed intervals T between synchronous dipulse and the chaotic fm phase modulation frequency expansion sequence when launching owing to signal according to step 5), can carry out synchronously thick by the relevant correlation peak that is detected of chaotic fm phase-modulated pulse copy, indicate chaotic fm phase modulation frequency expansion sequence initial position, that is:

$T_q=T+\hat{t}|{\hat{m}}_q^{\mathrm{CH}}\left(t\right)\≥D---\left(17\right)$

Because between the chaotic fm phase-modulated pulse all is mutually orthogonal, therefore difference detects the chaotic fm phase modulation frequency expansion sequence initial position that user's correlation peak can indicate different user.

In the technique scheme, in the described step 7), described channel equalization method adopts RLS equilibrium or turbo equilibrium, influences in order to reduce or to remove underwater acoustic channel.

In the technique scheme, in the described step 8), the set of described multi-user's packet M element spread spectrum copy is according to detected user ID and step 3) and 4 in the step 6)) respective process generate.It is W that correspondence detects number of users, then produces W*M group chaotic fm phase modulation spread spectrum copy signal.

${\mathrm{rep}}_w^m\left(t\right)=s_w^m\left(t\right)---\left(18\right)$

To carry out copy relevant with receiving data respectively for every group of copy signal:

$d_w^m\left(t\right)=\∫r\left(t\right)*{\mathrm{rep}}_w^m(t-t)\mathrm{d\τ}---\left(19\right)$

Because each spread-spectrum signal is mutually orthogonal, obtains by the Maximum Likelihood Detection peak value:

${\hat{m}}_w=\arg \max \left(d_w^m\left(t\right)\right)=\left\{\begin{array}{cc}{A}^2& m\&Element;(\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="HSA00000294863200011.png,HSA00000294863200041.png"\; state="\{\{state\}\}">m</figure-callout>}1,K,\mathrm{mr}){|}_w\\ 0& m\&NotElement;(\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="HSA00000294863200011.png,HSA00000294863200041.png"\; state="\{\{state\}\}">m</figure-callout>}1,K,\mathrm{mr}){|}_w\end{array}\right.---\left(13\right)$

According to detected peak value can detect respectively respective user w mapping combination (m1, K, mr) | _w, as shown in Figure 9.Each mapping combination is according to step 2) in the chaotic maps relation that obtains recover coded message (c ₁, c ₂, K, c _K) | _w

In the technique scheme, in the described step 9), described channel decoding method adopts Turbo algorithm or Viterbi algorithm, carries out source decoding again and recovers the communication information (x ₁, x ₂, K, x _L) | _w

For each user, can convert the message that receives to audio data stream by user's arbiter and message mapper, by the earphone played in order; Also can be presented on the surveillance equipment in water surface base in the mode of graphical display.

Embodiment 2

The portable communications sonar of short range real time communication is identical with embodiment 1 among the frogman under water that present embodiment provided, as shown in Figure 1.Present embodiment will be described the process of carrying out voice communication between the frogman by utility model equipment.

The chaotic fm phase modulation sequence of utilizing that present embodiment provided is carried out packet M element spread spectrum multi-user communication process, comprises communications transmit process and communications reception process, and described communications transmit process comprises the steps:

1) user profile that obtains according to control module, the parameters of definite emission obtains audio data stream by microphone, and changes by audio coder;

2) communication code data to be sent are divided into the data block of one group of K code element;

3) obtain chaos sequence according to certain chaotic maps relation, form chaotic fm value sequence mapping grouping and chaos phase modulation value sequence mapping grouping, and from grouping, select corresponding chaotic fm value sequence and the combination of chaos phase modulation value sequence according to the contained information of data block;

4) generate the set of chaotic fm phase modulation spread-spectrum signal by chaotic fm value sequence and the combination of chaos phase modulation value sequence, all chaotic fm phase modulation spread-spectrum signals in the described chaotic fm phase modulation spread-spectrum signal set are superimposed as one group of concurrent chaotic fm phase modulation spread-spectrum signal, and P organizes concurrent chaotic fm phase modulation spread-spectrum signal and forms a chaotic fm phase modulation frequency expansion sequence;

5) generate synchronous dipulse according to user profile, and make up, launch at last with chaotic fm phase modulation frequency expansion sequence;

Described communications reception method comprises the steps:

6) data to receiving by the synchronous dipulse copy of multi-user, are carried out the dipulse user and are detected with synchronously thick;

7) more detected user is received data and carry out channel equalization with synchronously thin;

8) then by relevant, detect and judgement, and recover coded message according to the chaotic maps relation with multi-user's packet M element spread spectrum copy set carrying out copy;

9) coded message is decoded, decoded information conversion back is play by earphone by user's arbiter and audio decoder.

In the technique scheme, in the described step 1), the user is provided with voice call pattern between the frogman by control module, is generally broadcast mode.The parameters of described emission is meant that transmit frequency band is 15kHz～25kHz, and transmission data rate is 8kbps, user ID (1～255) etc.Because the characteristics of the voice communication between the frogman are that communication distance is near, traffic rate is high, so adopt high band and high bandwidth.

In the technique scheme, described step 2) to 8) points for attention with embodiment 1.

In the technique scheme, in the described step 9), described channel decoding method is with embodiment 1.For each user, convert audio data stream to by user's arbiter and audio decoder, by the earphone played in order.

It should be noted that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims (3)

1. a frogman is with portable underwater sound communication equipment, comprise data input device, the communications transmit device, communication receiving device, data output device and the power supply and the interface arrangement that are connected with each device, it is characterized in that: described data input device is gathered voice signal, be sent to the communications transmit device behind the compressed coding of voice signal, the communications transmit device becomes acoustical signal to send in the underwater acoustic channel conversion of signals that receives, acoustical signal in the underwater acoustic channel is communicated by letter after the receiving device collection, change into the signal of telecommunication and be sent to data output device, data output device is play by earphone after with signal of telecommunication conversion processing;

Described data input device comprises microphone, audio coder and control module, described audio coder carries out the real non-destructive voice compression coding with the voice signal of microphone collection, and is sent to the communications transmit device, and described control module is provided with commands for controlling communications transmit device by knob;

Described communications transmit device comprises: parameter selector, user's mapper, data encoder, packet device, chaos sequence generator, the chaotic maps device, the Chaos Modulation device, clock-pulse generator, waveform generator, emission conversion and control module, transducer is put in matching network and power amplifier and transmitting-receiving altogether; Wherein, the instruction that described parameter selector provides according to control module, selection and frequency range and data transfer rate that the emission information category is complementary offer user's mapper and data encoder respectively; The chaos parameter that the parameter that described user's mapper provides according to parameter selector is selected to be complementary with the user sends to chaotic maps device and chaos sequence generator; Described data encoder carries out source encoding and chnnel coding according to the parameter that parameter selector provides to the speech data that message is instructed or audio coder provides that control module provides; Described packet device divides into groups the data flow that data encoder sends, and is sent to the Chaos Modulation device; Described chaos sequence generator produces the chaos sequence of being determined by different initial values according to the parameter that user's mapper provides by the chaotic maps equation, and is sent to chaotic maps device and clock-pulse generator; The parameter that described chaotic maps device is provided according to user's mapper is shone upon the chaos sequence that chaos sequence generator produced and is generated mutually orthogonal chaotic fm value sequence mapping grouping and chaos phase modulation value sequence mapping grouping, and these groupings are sent to the Chaos Modulation device; Chaotic fm value sequence mapping grouping and chaos phase modulation value sequence mapping grouping that described Chaos Modulation device provides according to the chaotic maps device, carry out the modulation of packet M element chaos spread spectrum, the packet that the packet device is provided is modulated into transmit data blocks, and is sent to waveform generator; User's synchronous chaos sequence that clock-pulse generator provides according to chaos sequence generator generates and forms synchronous dipulse by chirp and chaotic fm phase-modulated pulse, and is sent to waveform generator; The synchronous dipulse that transmit data blocks that waveform generator provides the Chaos Modulation device and clock-pulse generator provide makes up and generates final communications transmit signal, and sends to emission conversion and control module; Described emission conversion and control module are carried out D/A switch and emission conditioning with the communications transmit signal, and analog transmit signal and emission parameter are delivered to matching network and power amplifier; Described matching network and power amplifier drive the power amplification and the coupling of carrying out analog transmit signal by emission conversion and control module; Described transmitting-receiving is put transducer altogether and is positioned at cylindric elongated watertight jar top, under the driving of matching network and power amplifier, converts analog transmit signal to acoustical signal and sends in the underwater acoustic channel;

Described communication receiving device comprises that transmitting-receiving puts transducer, pre-filtering and amplifier, A/D converter, synchronizing indicator, clock-pulse generator, chaos sequence generator, copy maker, channel equalizer, chaos demodulator, data decoder altogether; Wherein, described transmitting-receiving is put transducer altogether and is responsible for gathering underwater sound data, carries out the acoustic-electric conversion and is sent to pre-filtering and amplifier; Described pre-filtering and amplifier carry out filtering and amplification to analog receiving signal, deliver to A/D converter; Described A/D converter converts analog receiving signal to digital signal, is sent to synchronizing indicator; Described chaos sequence generator produces the chaos sequence that all users may use in the channel by the chaotic maps equation, and is sent to copy maker and clock-pulse generator; Multi-user's synchronous chaos sequence that described clock-pulse generator provides according to chaos sequence generator generates and forms the synchronous dipulse copy of multi-user by chirp and chaotic fm phase-modulated pulse, and is sent to synchronizing indicator; Described synchronizing indicator communicates input according to the synchronous dipulse copy of multi-user that clock-pulse generator provides, if detect signal of communication then after carrying out synchronously data are sent to channel equalizer, and the respective user sign is sent to the copy maker; Described channel equalizer carries out channel equalization to signal of communication, after deliver to the chaos demodulator; The user ID that chaos sequence that described copy maker provides according to chaos sequence generator and synchronizing indicator provide generates corresponding multi-user's packet M element spread spectrum copy set, delivers to the chaos demodulator; The correlation demodulation of chaos spread spectrum sequence is carried out in multi-user's packet M element spread spectrum copy set that data that described chaos demodulator provides according to channel equalizer and copy maker provide, and the generating solution adjusting data also is sent to data decoder; Described data decoder is decoded demodulating data and is generated reception information, is sent to data output device;

Described data output device comprises user's arbiter, message mapper, and audio coder and earphone, described user's arbiter is differentiated the data that communication receiving device obtains, and speech data is sent to audio coder, and message data is sent to message mapper; Described message mapper becomes to preset audio data stream with the message data content map and is sent to the earphone broadcast; Described audio decoder carries out the decoding of real non-destructive compress speech with speech data, and the decoded speech data flow is sent to the earphone broadcast.

2. frogman according to claim 1 is characterized in that with portable underwater sound communication equipment: described communications transmit device and the shared chaos sequence generator of communication receiving device, transducer is put in clock-pulse generator and transmitting-receiving altogether.

3. frogman according to claim 1 is with portable underwater sound communication equipment, it is characterized in that: equipment body is by elongated watertight jar, frogman's face shield and frogman's waistband three parts are formed, three parts connect by cable, described earphone and microphone are installed on frogman's face shield, described control module is arranged on frogman's waistband, and described power supply and interface module are arranged on the elongated watertight jar, and the top that transducer is arranged on elongated watertight jar is put in described transmitting-receiving altogether.

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